Inductive Power Outlet Guarding Against Uncoupled Transmission
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Solution Overview
Problem
Existing inductive power transfer systems face inefficiencies and safety concerns when attempting to wirelessly power high-energy devices, as they often result in energy loss, heat buildup, and electromagnetic interference, and lack practicality for small devices due to bulky designs and inefficient power management.
Innovation Solution
The development of an inductive power transfer system that includes a transmission guard to prevent power transmission without a coupled receiver, a low heat-loss full wave rectifier, a magnetic flux guide, and an alignment mechanism with a signal transfer system to ensure efficient and safe power delivery, using a primary coil connected to a power source via a driver and a secondary coil for coupling with an electric load, along with a heat dissipation system for handling high-power applications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If an inductive power outlet transmits power continuously over an extended area, then power availability is improved, but energy loss and heat generation increase significantly
Solution Approach 1:
The patent divides the charging surface into multiple discrete primary coil outlets instead of using a single continuous planar winding. Each coil can be independently controlled and activated only when a receiver is detected nearby, thereby maintaining power availability across multiple locations while reducing overall energy loss by avoiding continuous transmission over the entire extended area.
Solution Approach 2:
The system implements periodic detection and activation of primary coils based on the presence of secondary coils. Rather than continuous transmission, the outlet monitors for receivers and activates power transmission only when needed, creating a periodic on-demand operation pattern that reduces energy loss while maintaining availability.
2Power
If a high power primary coil operates without a coupled secondary coil, then power transmission capability is maintained, but dangerous electromagnetic radiation is generated
Solution Approach 1:
The patent incorporates a detection system that monitors for the presence of secondary coils coupled to primary coils. Based on this feedback, the control system activates or deactivates the primary coils accordingly. This feedback mechanism ensures that high power transmission occurs only when a receiver is properly coupled, preventing dangerous electromagnetic radiation while maintaining power transmission capability when needed.
Solution Approach 2:
The system performs preliminary detection of secondary coil presence before activating high power transmission. By checking for coupled receivers in advance and only then enabling power transmission, the system prevents dangerous electromagnetic radiation from occurring while maintaining the capability to transmit power when properly coupled.
3Volume of moving object
If inductive power outlets are made compact for small devices, then device size is reduced, but alignment precision and power transfer efficiency become more difficult to maintain
Solution Approach 1:
The patent employs active control and detection systems that dynamically adjust to alignment conditions. The system monitors coupling status and can provide feedback to guide users into proper alignment, making the compact outlet tolerant of alignment variations while maintaining power transfer efficiency through active compensation rather than relying solely on mechanical precision.
Solution Approach 2:
The system monitors and responds to changes in coupling parameters such as inductance and impedance that occur during alignment. By detecting these parameter changes and adjusting operation accordingly, the compact outlet maintains power transfer efficiency even with limited alignment precision, using electrical parameter feedback rather than mechanical precision.
4Productivity
If continuous power transmission is used in low power systems, then seamless power delivery is achieved, but excess heat dissipation becomes problematic in high power systems
Solution Approach 1:
The patent implements periodic detection and on-demand activation of primary coils rather than continuous transmission. Power is transmitted only when a secondary coil is detected and properly coupled, creating an intermittent operation pattern that maintains seamless power delivery when needed while dramatically reducing heat generation by eliminating continuous transmission in high power systems.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This system effectively prevents unnecessary power transmission, reduces heat loss, and enhances safety and efficiency in delivering power wirelessly to high-energy devices, making it suitable for a broader range of applications including small electrical devices.
Implementation Method 1
A power supply is wired to a primary coil and an oscillating electric potential is applied across the primary coil, thereby inducing an oscillating magnetic field. The oscillating magnetic field may induce an oscillating electrical current in a secondary coil placed close to the primary coil.
Implementation Method 2
The oscillating magnetic field may induce an oscillating electrical current in a secondary coil placed close to the primary coil. In this way, electrical energy may be transmitted from the primary coil to the secondary coil by electromagnetic induction without the two coils being conductively connected.
Implementation Method 3
a low heat-loss full wave rectifier
Implementation Method 4
a magnetic flux guide
Implementation Method 5
a heat dissipation system for handling high-power applications
Data Source
AI summary
An inductive power outlet operable to transfer power to an inductive power receiver includes a driver wired to a primary inductive coil and operable to provide a driving voltage across the primary inductive coil. The primary inductive coil is configured to form an inductive couple having a characteristic resonant frequency with at least one secondary inductive coil wired to an electric load, the secondary inductive coil being associated with the inductive power receiver. The driving voltage oscillates at a transmission frequency substantially different from the characteristic resonant frequency of the inductive couple.